App Notifications depending on resistance changes

Hi All,

First time poster so be gentle…

I want to be able to monitor resistance values from a wearable device over Bluetooth to a mobile app, do you know the best way to do this?

An example could be if I’m warring a light sensor, I want my phone to vibrate when it’s below a certain light level and then vibrate again when lights come back on.

Is there a funky little device with a premade app already out there?

Many thanks

TokyoMiningCo